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[PATCH] smc91c92_cs: Reduce stack usage in smc91c92_event()
[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / drivers / net / ixgb / ixgb_main.c
1 /*******************************************************************************
2
3
4 Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
5
6 This program is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 2 of the License, or (at your option)
9 any later version.
10
11 This program is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 more details.
15
16 You should have received a copy of the GNU General Public License along with
17 this program; if not, write to the Free Software Foundation, Inc., 59
18 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19
20 The full GNU General Public License is included in this distribution in the
21 file called LICENSE.
22
23 Contact Information:
24 Linux NICS <linux.nics@intel.com>
25 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26
27 *******************************************************************************/
28
29 #include "ixgb.h"
30
31 /* Change Log
32 * 1.0.88 01/05/05
33 * - include fix to the condition that determines when to quit NAPI - Robert Olsson
34 * - use netif_poll_{disable/enable} to synchronize between NAPI and i/f up/down
35 * 1.0.84 10/26/04
36 * - reset buffer_info->dma in Tx resource cleanup logic
37 * 1.0.83 10/12/04
38 * - sparse cleanup - shemminger@osdl.org
39 * - fix tx resource cleanup logic
40 */
41
42 char ixgb_driver_name[] = "ixgb";
43 char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
44
45 #ifndef CONFIG_IXGB_NAPI
46 #define DRIVERNAPI
47 #else
48 #define DRIVERNAPI "-NAPI"
49 #endif
50 #define DRV_VERSION "1.0.90-k2"DRIVERNAPI
51 char ixgb_driver_version[] = DRV_VERSION;
52 char ixgb_copyright[] = "Copyright (c) 1999-2005 Intel Corporation.";
53
54 /* ixgb_pci_tbl - PCI Device ID Table
55 *
56 * Wildcard entries (PCI_ANY_ID) should come last
57 * Last entry must be all 0s
58 *
59 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
60 * Class, Class Mask, private data (not used) }
61 */
62 static struct pci_device_id ixgb_pci_tbl[] = {
63 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
64 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
65 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
66 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
67 {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
68 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
69
70 /* required last entry */
71 {0,}
72 };
73
74 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
75
76 /* Local Function Prototypes */
77
78 int ixgb_up(struct ixgb_adapter *adapter);
79 void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
80 void ixgb_reset(struct ixgb_adapter *adapter);
81 int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
82 int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
83 void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
84 void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
85 void ixgb_update_stats(struct ixgb_adapter *adapter);
86
87 static int ixgb_init_module(void);
88 static void ixgb_exit_module(void);
89 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
90 static void __devexit ixgb_remove(struct pci_dev *pdev);
91 static int ixgb_sw_init(struct ixgb_adapter *adapter);
92 static int ixgb_open(struct net_device *netdev);
93 static int ixgb_close(struct net_device *netdev);
94 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
95 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
96 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
97 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
98 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
99 static void ixgb_set_multi(struct net_device *netdev);
100 static void ixgb_watchdog(unsigned long data);
101 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
102 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
103 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
104 static int ixgb_set_mac(struct net_device *netdev, void *p);
105 static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
106 static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
107 #ifdef CONFIG_IXGB_NAPI
108 static int ixgb_clean(struct net_device *netdev, int *budget);
109 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
110 int *work_done, int work_to_do);
111 #else
112 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
113 #endif
114 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
115 void ixgb_set_ethtool_ops(struct net_device *netdev);
116 static void ixgb_tx_timeout(struct net_device *dev);
117 static void ixgb_tx_timeout_task(struct net_device *dev);
118 static void ixgb_vlan_rx_register(struct net_device *netdev,
119 struct vlan_group *grp);
120 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
121 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
122 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
123
124 static int ixgb_notify_reboot(struct notifier_block *, unsigned long event,
125 void *ptr);
126 static int ixgb_suspend(struct pci_dev *pdev, uint32_t state);
127
128 #ifdef CONFIG_NET_POLL_CONTROLLER
129 /* for netdump / net console */
130 static void ixgb_netpoll(struct net_device *dev);
131 #endif
132
133 struct notifier_block ixgb_notifier_reboot = {
134 .notifier_call = ixgb_notify_reboot,
135 .next = NULL,
136 .priority = 0
137 };
138
139 /* Exported from other modules */
140
141 extern void ixgb_check_options(struct ixgb_adapter *adapter);
142
143 static struct pci_driver ixgb_driver = {
144 .name = ixgb_driver_name,
145 .id_table = ixgb_pci_tbl,
146 .probe = ixgb_probe,
147 .remove = __devexit_p(ixgb_remove),
148 /* Power Managment Hooks */
149 .suspend = NULL,
150 .resume = NULL
151 };
152
153 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
154 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
155 MODULE_LICENSE("GPL");
156 MODULE_VERSION(DRV_VERSION);
157
158 /* some defines for controlling descriptor fetches in h/w */
159 #define RXDCTL_PTHRESH_DEFAULT 128 /* chip considers prefech below this */
160 #define RXDCTL_HTHRESH_DEFAULT 16 /* chip will only prefetch if tail is
161 pushed this many descriptors from head */
162 #define RXDCTL_WTHRESH_DEFAULT 16 /* chip writes back at this many or RXT0 */
163
164 /**
165 * ixgb_init_module - Driver Registration Routine
166 *
167 * ixgb_init_module is the first routine called when the driver is
168 * loaded. All it does is register with the PCI subsystem.
169 **/
170
171 static int __init
172 ixgb_init_module(void)
173 {
174 int ret;
175 printk(KERN_INFO "%s - version %s\n",
176 ixgb_driver_string, ixgb_driver_version);
177
178 printk(KERN_INFO "%s\n", ixgb_copyright);
179
180 ret = pci_module_init(&ixgb_driver);
181 if(ret >= 0) {
182 register_reboot_notifier(&ixgb_notifier_reboot);
183 }
184 return ret;
185 }
186
187 module_init(ixgb_init_module);
188
189 /**
190 * ixgb_exit_module - Driver Exit Cleanup Routine
191 *
192 * ixgb_exit_module is called just before the driver is removed
193 * from memory.
194 **/
195
196 static void __exit
197 ixgb_exit_module(void)
198 {
199 unregister_reboot_notifier(&ixgb_notifier_reboot);
200 pci_unregister_driver(&ixgb_driver);
201 }
202
203 module_exit(ixgb_exit_module);
204
205 /**
206 * ixgb_irq_disable - Mask off interrupt generation on the NIC
207 * @adapter: board private structure
208 **/
209
210 static inline void
211 ixgb_irq_disable(struct ixgb_adapter *adapter)
212 {
213 atomic_inc(&adapter->irq_sem);
214 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
215 IXGB_WRITE_FLUSH(&adapter->hw);
216 synchronize_irq(adapter->pdev->irq);
217 }
218
219 /**
220 * ixgb_irq_enable - Enable default interrupt generation settings
221 * @adapter: board private structure
222 **/
223
224 static inline void
225 ixgb_irq_enable(struct ixgb_adapter *adapter)
226 {
227 if(atomic_dec_and_test(&adapter->irq_sem)) {
228 IXGB_WRITE_REG(&adapter->hw, IMS,
229 IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
230 IXGB_INT_RXO | IXGB_INT_LSC);
231 IXGB_WRITE_FLUSH(&adapter->hw);
232 }
233 }
234
235 int
236 ixgb_up(struct ixgb_adapter *adapter)
237 {
238 struct net_device *netdev = adapter->netdev;
239 int err;
240 int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
241 struct ixgb_hw *hw = &adapter->hw;
242
243 /* hardware has been reset, we need to reload some things */
244
245 ixgb_set_multi(netdev);
246
247 ixgb_restore_vlan(adapter);
248
249 ixgb_configure_tx(adapter);
250 ixgb_setup_rctl(adapter);
251 ixgb_configure_rx(adapter);
252 ixgb_alloc_rx_buffers(adapter);
253
254 #ifdef CONFIG_PCI_MSI
255 {
256 boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) &
257 IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
258 adapter->have_msi = TRUE;
259
260 if (!pcix)
261 adapter->have_msi = FALSE;
262 else if((err = pci_enable_msi(adapter->pdev))) {
263 printk (KERN_ERR
264 "Unable to allocate MSI interrupt Error: %d\n", err);
265 adapter->have_msi = FALSE;
266 /* proceed to try to request regular interrupt */
267 }
268 }
269
270 #endif
271 if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
272 SA_SHIRQ | SA_SAMPLE_RANDOM,
273 netdev->name, netdev)))
274 return err;
275
276 /* disable interrupts and get the hardware into a known state */
277 IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
278
279 if((hw->max_frame_size != max_frame) ||
280 (hw->max_frame_size !=
281 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
282
283 hw->max_frame_size = max_frame;
284
285 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
286
287 if(hw->max_frame_size >
288 IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
289 uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
290
291 if(!(ctrl0 & IXGB_CTRL0_JFE)) {
292 ctrl0 |= IXGB_CTRL0_JFE;
293 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
294 }
295 }
296 }
297
298 mod_timer(&adapter->watchdog_timer, jiffies);
299 ixgb_irq_enable(adapter);
300
301 #ifdef CONFIG_IXGB_NAPI
302 netif_poll_enable(netdev);
303 #endif
304 return 0;
305 }
306
307 void
308 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
309 {
310 struct net_device *netdev = adapter->netdev;
311
312 ixgb_irq_disable(adapter);
313 free_irq(adapter->pdev->irq, netdev);
314 #ifdef CONFIG_PCI_MSI
315 if(adapter->have_msi == TRUE)
316 pci_disable_msi(adapter->pdev);
317
318 #endif
319 if(kill_watchdog)
320 del_timer_sync(&adapter->watchdog_timer);
321 #ifdef CONFIG_IXGB_NAPI
322 netif_poll_disable(netdev);
323 #endif
324 adapter->link_speed = 0;
325 adapter->link_duplex = 0;
326 netif_carrier_off(netdev);
327 netif_stop_queue(netdev);
328
329 ixgb_reset(adapter);
330 ixgb_clean_tx_ring(adapter);
331 ixgb_clean_rx_ring(adapter);
332 }
333
334 void
335 ixgb_reset(struct ixgb_adapter *adapter)
336 {
337
338 ixgb_adapter_stop(&adapter->hw);
339 if(!ixgb_init_hw(&adapter->hw))
340 IXGB_DBG("ixgb_init_hw failed.\n");
341 }
342
343 /**
344 * ixgb_probe - Device Initialization Routine
345 * @pdev: PCI device information struct
346 * @ent: entry in ixgb_pci_tbl
347 *
348 * Returns 0 on success, negative on failure
349 *
350 * ixgb_probe initializes an adapter identified by a pci_dev structure.
351 * The OS initialization, configuring of the adapter private structure,
352 * and a hardware reset occur.
353 **/
354
355 static int __devinit
356 ixgb_probe(struct pci_dev *pdev,
357 const struct pci_device_id *ent)
358 {
359 struct net_device *netdev = NULL;
360 struct ixgb_adapter *adapter;
361 static int cards_found = 0;
362 unsigned long mmio_start;
363 int mmio_len;
364 int pci_using_dac;
365 int i;
366 int err;
367
368 if((err = pci_enable_device(pdev)))
369 return err;
370
371 if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK))) {
372 pci_using_dac = 1;
373 } else {
374 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK))) {
375 IXGB_ERR("No usable DMA configuration, aborting\n");
376 return err;
377 }
378 pci_using_dac = 0;
379 }
380
381 if((err = pci_request_regions(pdev, ixgb_driver_name)))
382 return err;
383
384 pci_set_master(pdev);
385
386 netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
387 if(!netdev) {
388 err = -ENOMEM;
389 goto err_alloc_etherdev;
390 }
391
392 SET_MODULE_OWNER(netdev);
393 SET_NETDEV_DEV(netdev, &pdev->dev);
394
395 pci_set_drvdata(pdev, netdev);
396 adapter = netdev->priv;
397 adapter->netdev = netdev;
398 adapter->pdev = pdev;
399 adapter->hw.back = adapter;
400
401 mmio_start = pci_resource_start(pdev, BAR_0);
402 mmio_len = pci_resource_len(pdev, BAR_0);
403
404 adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
405 if(!adapter->hw.hw_addr) {
406 err = -EIO;
407 goto err_ioremap;
408 }
409
410 for(i = BAR_1; i <= BAR_5; i++) {
411 if(pci_resource_len(pdev, i) == 0)
412 continue;
413 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
414 adapter->hw.io_base = pci_resource_start(pdev, i);
415 break;
416 }
417 }
418
419 netdev->open = &ixgb_open;
420 netdev->stop = &ixgb_close;
421 netdev->hard_start_xmit = &ixgb_xmit_frame;
422 netdev->get_stats = &ixgb_get_stats;
423 netdev->set_multicast_list = &ixgb_set_multi;
424 netdev->set_mac_address = &ixgb_set_mac;
425 netdev->change_mtu = &ixgb_change_mtu;
426 ixgb_set_ethtool_ops(netdev);
427 netdev->tx_timeout = &ixgb_tx_timeout;
428 netdev->watchdog_timeo = HZ;
429 #ifdef CONFIG_IXGB_NAPI
430 netdev->poll = &ixgb_clean;
431 netdev->weight = 64;
432 #endif
433 netdev->vlan_rx_register = ixgb_vlan_rx_register;
434 netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
435 netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
436 #ifdef CONFIG_NET_POLL_CONTROLLER
437 netdev->poll_controller = ixgb_netpoll;
438 #endif
439
440 netdev->mem_start = mmio_start;
441 netdev->mem_end = mmio_start + mmio_len;
442 netdev->base_addr = adapter->hw.io_base;
443
444 adapter->bd_number = cards_found;
445 adapter->link_speed = 0;
446 adapter->link_duplex = 0;
447
448 /* setup the private structure */
449
450 if((err = ixgb_sw_init(adapter)))
451 goto err_sw_init;
452
453 netdev->features = NETIF_F_SG |
454 NETIF_F_HW_CSUM |
455 NETIF_F_HW_VLAN_TX |
456 NETIF_F_HW_VLAN_RX |
457 NETIF_F_HW_VLAN_FILTER;
458 #ifdef NETIF_F_TSO
459 netdev->features |= NETIF_F_TSO;
460 #endif
461
462 if(pci_using_dac)
463 netdev->features |= NETIF_F_HIGHDMA;
464
465 /* make sure the EEPROM is good */
466
467 if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
468 printk(KERN_ERR "The EEPROM Checksum Is Not Valid\n");
469 err = -EIO;
470 goto err_eeprom;
471 }
472
473 ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
474
475 if(!is_valid_ether_addr(netdev->dev_addr)) {
476 err = -EIO;
477 goto err_eeprom;
478 }
479
480 adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
481
482 init_timer(&adapter->watchdog_timer);
483 adapter->watchdog_timer.function = &ixgb_watchdog;
484 adapter->watchdog_timer.data = (unsigned long)adapter;
485
486 INIT_WORK(&adapter->tx_timeout_task,
487 (void (*)(void *))ixgb_tx_timeout_task, netdev);
488
489 if((err = register_netdev(netdev)))
490 goto err_register;
491
492 /* we're going to reset, so assume we have no link for now */
493
494 netif_carrier_off(netdev);
495 netif_stop_queue(netdev);
496
497 printk(KERN_INFO "%s: Intel(R) PRO/10GbE Network Connection\n",
498 netdev->name);
499 ixgb_check_options(adapter);
500 /* reset the hardware with the new settings */
501
502 ixgb_reset(adapter);
503
504 cards_found++;
505 return 0;
506
507 err_register:
508 err_sw_init:
509 err_eeprom:
510 iounmap(adapter->hw.hw_addr);
511 err_ioremap:
512 free_netdev(netdev);
513 err_alloc_etherdev:
514 pci_release_regions(pdev);
515 return err;
516 }
517
518 /**
519 * ixgb_remove - Device Removal Routine
520 * @pdev: PCI device information struct
521 *
522 * ixgb_remove is called by the PCI subsystem to alert the driver
523 * that it should release a PCI device. The could be caused by a
524 * Hot-Plug event, or because the driver is going to be removed from
525 * memory.
526 **/
527
528 static void __devexit
529 ixgb_remove(struct pci_dev *pdev)
530 {
531 struct net_device *netdev = pci_get_drvdata(pdev);
532 struct ixgb_adapter *adapter = netdev->priv;
533
534 unregister_netdev(netdev);
535
536 iounmap(adapter->hw.hw_addr);
537 pci_release_regions(pdev);
538
539 free_netdev(netdev);
540 }
541
542 /**
543 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
544 * @adapter: board private structure to initialize
545 *
546 * ixgb_sw_init initializes the Adapter private data structure.
547 * Fields are initialized based on PCI device information and
548 * OS network device settings (MTU size).
549 **/
550
551 static int __devinit
552 ixgb_sw_init(struct ixgb_adapter *adapter)
553 {
554 struct ixgb_hw *hw = &adapter->hw;
555 struct net_device *netdev = adapter->netdev;
556 struct pci_dev *pdev = adapter->pdev;
557
558 /* PCI config space info */
559
560 hw->vendor_id = pdev->vendor;
561 hw->device_id = pdev->device;
562 hw->subsystem_vendor_id = pdev->subsystem_vendor;
563 hw->subsystem_id = pdev->subsystem_device;
564
565 adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
566
567 hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
568
569 if((hw->device_id == IXGB_DEVICE_ID_82597EX)
570 ||(hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
571 ||(hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
572 hw->mac_type = ixgb_82597;
573 else {
574 /* should never have loaded on this device */
575 printk(KERN_ERR "ixgb: unsupported device id\n");
576 }
577
578 /* enable flow control to be programmed */
579 hw->fc.send_xon = 1;
580
581 atomic_set(&adapter->irq_sem, 1);
582 spin_lock_init(&adapter->tx_lock);
583
584 return 0;
585 }
586
587 /**
588 * ixgb_open - Called when a network interface is made active
589 * @netdev: network interface device structure
590 *
591 * Returns 0 on success, negative value on failure
592 *
593 * The open entry point is called when a network interface is made
594 * active by the system (IFF_UP). At this point all resources needed
595 * for transmit and receive operations are allocated, the interrupt
596 * handler is registered with the OS, the watchdog timer is started,
597 * and the stack is notified that the interface is ready.
598 **/
599
600 static int
601 ixgb_open(struct net_device *netdev)
602 {
603 struct ixgb_adapter *adapter = netdev->priv;
604 int err;
605
606 /* allocate transmit descriptors */
607
608 if((err = ixgb_setup_tx_resources(adapter)))
609 goto err_setup_tx;
610
611 /* allocate receive descriptors */
612
613 if((err = ixgb_setup_rx_resources(adapter)))
614 goto err_setup_rx;
615
616 if((err = ixgb_up(adapter)))
617 goto err_up;
618
619 return 0;
620
621 err_up:
622 ixgb_free_rx_resources(adapter);
623 err_setup_rx:
624 ixgb_free_tx_resources(adapter);
625 err_setup_tx:
626 ixgb_reset(adapter);
627
628 return err;
629 }
630
631 /**
632 * ixgb_close - Disables a network interface
633 * @netdev: network interface device structure
634 *
635 * Returns 0, this is not allowed to fail
636 *
637 * The close entry point is called when an interface is de-activated
638 * by the OS. The hardware is still under the drivers control, but
639 * needs to be disabled. A global MAC reset is issued to stop the
640 * hardware, and all transmit and receive resources are freed.
641 **/
642
643 static int
644 ixgb_close(struct net_device *netdev)
645 {
646 struct ixgb_adapter *adapter = netdev->priv;
647
648 ixgb_down(adapter, TRUE);
649
650 ixgb_free_tx_resources(adapter);
651 ixgb_free_rx_resources(adapter);
652
653 return 0;
654 }
655
656 /**
657 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
658 * @adapter: board private structure
659 *
660 * Return 0 on success, negative on failure
661 **/
662
663 int
664 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
665 {
666 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
667 struct pci_dev *pdev = adapter->pdev;
668 int size;
669
670 size = sizeof(struct ixgb_buffer) * txdr->count;
671 txdr->buffer_info = vmalloc(size);
672 if(!txdr->buffer_info) {
673 return -ENOMEM;
674 }
675 memset(txdr->buffer_info, 0, size);
676
677 /* round up to nearest 4K */
678
679 txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
680 IXGB_ROUNDUP(txdr->size, 4096);
681
682 txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
683 if(!txdr->desc) {
684 vfree(txdr->buffer_info);
685 return -ENOMEM;
686 }
687 memset(txdr->desc, 0, txdr->size);
688
689 txdr->next_to_use = 0;
690 txdr->next_to_clean = 0;
691
692 return 0;
693 }
694
695 /**
696 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
697 * @adapter: board private structure
698 *
699 * Configure the Tx unit of the MAC after a reset.
700 **/
701
702 static void
703 ixgb_configure_tx(struct ixgb_adapter *adapter)
704 {
705 uint64_t tdba = adapter->tx_ring.dma;
706 uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
707 uint32_t tctl;
708 struct ixgb_hw *hw = &adapter->hw;
709
710 /* Setup the Base and Length of the Tx Descriptor Ring
711 * tx_ring.dma can be either a 32 or 64 bit value
712 */
713
714 IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
715 IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
716
717 IXGB_WRITE_REG(hw, TDLEN, tdlen);
718
719 /* Setup the HW Tx Head and Tail descriptor pointers */
720
721 IXGB_WRITE_REG(hw, TDH, 0);
722 IXGB_WRITE_REG(hw, TDT, 0);
723
724 /* don't set up txdctl, it induces performance problems if configured
725 * incorrectly */
726 /* Set the Tx Interrupt Delay register */
727
728 IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
729
730 /* Program the Transmit Control Register */
731
732 tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
733 IXGB_WRITE_REG(hw, TCTL, tctl);
734
735 /* Setup Transmit Descriptor Settings for this adapter */
736 adapter->tx_cmd_type =
737 IXGB_TX_DESC_TYPE
738 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
739 }
740
741 /**
742 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
743 * @adapter: board private structure
744 *
745 * Returns 0 on success, negative on failure
746 **/
747
748 int
749 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
750 {
751 struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
752 struct pci_dev *pdev = adapter->pdev;
753 int size;
754
755 size = sizeof(struct ixgb_buffer) * rxdr->count;
756 rxdr->buffer_info = vmalloc(size);
757 if(!rxdr->buffer_info) {
758 return -ENOMEM;
759 }
760 memset(rxdr->buffer_info, 0, size);
761
762 /* Round up to nearest 4K */
763
764 rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
765 IXGB_ROUNDUP(rxdr->size, 4096);
766
767 rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
768
769 if(!rxdr->desc) {
770 vfree(rxdr->buffer_info);
771 return -ENOMEM;
772 }
773 memset(rxdr->desc, 0, rxdr->size);
774
775 rxdr->next_to_clean = 0;
776 rxdr->next_to_use = 0;
777
778 return 0;
779 }
780
781 /**
782 * ixgb_setup_rctl - configure the receive control register
783 * @adapter: Board private structure
784 **/
785
786 static void
787 ixgb_setup_rctl(struct ixgb_adapter *adapter)
788 {
789 uint32_t rctl;
790
791 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
792
793 rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
794
795 rctl |=
796 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
797 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
798 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
799
800 rctl |= IXGB_RCTL_SECRC;
801
802 switch (adapter->rx_buffer_len) {
803 case IXGB_RXBUFFER_2048:
804 default:
805 rctl |= IXGB_RCTL_BSIZE_2048;
806 break;
807 case IXGB_RXBUFFER_4096:
808 rctl |= IXGB_RCTL_BSIZE_4096;
809 break;
810 case IXGB_RXBUFFER_8192:
811 rctl |= IXGB_RCTL_BSIZE_8192;
812 break;
813 case IXGB_RXBUFFER_16384:
814 rctl |= IXGB_RCTL_BSIZE_16384;
815 break;
816 }
817
818 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
819 }
820
821 /**
822 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
823 * @adapter: board private structure
824 *
825 * Configure the Rx unit of the MAC after a reset.
826 **/
827
828 static void
829 ixgb_configure_rx(struct ixgb_adapter *adapter)
830 {
831 uint64_t rdba = adapter->rx_ring.dma;
832 uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
833 struct ixgb_hw *hw = &adapter->hw;
834 uint32_t rctl;
835 uint32_t rxcsum;
836 uint32_t rxdctl;
837
838 /* make sure receives are disabled while setting up the descriptors */
839
840 rctl = IXGB_READ_REG(hw, RCTL);
841 IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
842
843 /* set the Receive Delay Timer Register */
844
845 IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
846
847 /* Setup the Base and Length of the Rx Descriptor Ring */
848
849 IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
850 IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
851
852 IXGB_WRITE_REG(hw, RDLEN, rdlen);
853
854 /* Setup the HW Rx Head and Tail Descriptor Pointers */
855 IXGB_WRITE_REG(hw, RDH, 0);
856 IXGB_WRITE_REG(hw, RDT, 0);
857
858 /* set up pre-fetching of receive buffers so we get some before we
859 * run out (default hardware behavior is to run out before fetching
860 * more). This sets up to fetch if HTHRESH rx descriptors are avail
861 * and the descriptors in hw cache are below PTHRESH. This avoids
862 * the hardware behavior of fetching <=512 descriptors in a single
863 * burst that pre-empts all other activity, usually causing fifo
864 * overflows. */
865 /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
866 rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
867 RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
868 RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
869 IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
870
871 /* Enable Receive Checksum Offload for TCP and UDP */
872 if(adapter->rx_csum == TRUE) {
873 rxcsum = IXGB_READ_REG(hw, RXCSUM);
874 rxcsum |= IXGB_RXCSUM_TUOFL;
875 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
876 }
877
878 /* Enable Receives */
879
880 IXGB_WRITE_REG(hw, RCTL, rctl);
881 }
882
883 /**
884 * ixgb_free_tx_resources - Free Tx Resources
885 * @adapter: board private structure
886 *
887 * Free all transmit software resources
888 **/
889
890 void
891 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
892 {
893 struct pci_dev *pdev = adapter->pdev;
894
895 ixgb_clean_tx_ring(adapter);
896
897 vfree(adapter->tx_ring.buffer_info);
898 adapter->tx_ring.buffer_info = NULL;
899
900 pci_free_consistent(pdev, adapter->tx_ring.size,
901 adapter->tx_ring.desc, adapter->tx_ring.dma);
902
903 adapter->tx_ring.desc = NULL;
904 }
905
906 static inline void
907 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
908 struct ixgb_buffer *buffer_info)
909 {
910 struct pci_dev *pdev = adapter->pdev;
911 if(buffer_info->dma) {
912 pci_unmap_page(pdev,
913 buffer_info->dma,
914 buffer_info->length,
915 PCI_DMA_TODEVICE);
916 buffer_info->dma = 0;
917 }
918 if(buffer_info->skb) {
919 dev_kfree_skb_any(buffer_info->skb);
920 buffer_info->skb = NULL;
921 }
922 }
923
924 /**
925 * ixgb_clean_tx_ring - Free Tx Buffers
926 * @adapter: board private structure
927 **/
928
929 static void
930 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
931 {
932 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
933 struct ixgb_buffer *buffer_info;
934 unsigned long size;
935 unsigned int i;
936
937 /* Free all the Tx ring sk_buffs */
938
939 for(i = 0; i < tx_ring->count; i++) {
940 buffer_info = &tx_ring->buffer_info[i];
941 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
942 }
943
944 size = sizeof(struct ixgb_buffer) * tx_ring->count;
945 memset(tx_ring->buffer_info, 0, size);
946
947 /* Zero out the descriptor ring */
948
949 memset(tx_ring->desc, 0, tx_ring->size);
950
951 tx_ring->next_to_use = 0;
952 tx_ring->next_to_clean = 0;
953
954 IXGB_WRITE_REG(&adapter->hw, TDH, 0);
955 IXGB_WRITE_REG(&adapter->hw, TDT, 0);
956 }
957
958 /**
959 * ixgb_free_rx_resources - Free Rx Resources
960 * @adapter: board private structure
961 *
962 * Free all receive software resources
963 **/
964
965 void
966 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
967 {
968 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
969 struct pci_dev *pdev = adapter->pdev;
970
971 ixgb_clean_rx_ring(adapter);
972
973 vfree(rx_ring->buffer_info);
974 rx_ring->buffer_info = NULL;
975
976 pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
977
978 rx_ring->desc = NULL;
979 }
980
981 /**
982 * ixgb_clean_rx_ring - Free Rx Buffers
983 * @adapter: board private structure
984 **/
985
986 static void
987 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
988 {
989 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
990 struct ixgb_buffer *buffer_info;
991 struct pci_dev *pdev = adapter->pdev;
992 unsigned long size;
993 unsigned int i;
994
995 /* Free all the Rx ring sk_buffs */
996
997 for(i = 0; i < rx_ring->count; i++) {
998 buffer_info = &rx_ring->buffer_info[i];
999 if(buffer_info->skb) {
1000
1001 pci_unmap_single(pdev,
1002 buffer_info->dma,
1003 buffer_info->length,
1004 PCI_DMA_FROMDEVICE);
1005
1006 dev_kfree_skb(buffer_info->skb);
1007
1008 buffer_info->skb = NULL;
1009 }
1010 }
1011
1012 size = sizeof(struct ixgb_buffer) * rx_ring->count;
1013 memset(rx_ring->buffer_info, 0, size);
1014
1015 /* Zero out the descriptor ring */
1016
1017 memset(rx_ring->desc, 0, rx_ring->size);
1018
1019 rx_ring->next_to_clean = 0;
1020 rx_ring->next_to_use = 0;
1021
1022 IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1023 IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1024 }
1025
1026 /**
1027 * ixgb_set_mac - Change the Ethernet Address of the NIC
1028 * @netdev: network interface device structure
1029 * @p: pointer to an address structure
1030 *
1031 * Returns 0 on success, negative on failure
1032 **/
1033
1034 static int
1035 ixgb_set_mac(struct net_device *netdev, void *p)
1036 {
1037 struct ixgb_adapter *adapter = netdev->priv;
1038 struct sockaddr *addr = p;
1039
1040 if(!is_valid_ether_addr(addr->sa_data))
1041 return -EADDRNOTAVAIL;
1042
1043 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1044
1045 ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1046
1047 return 0;
1048 }
1049
1050 /**
1051 * ixgb_set_multi - Multicast and Promiscuous mode set
1052 * @netdev: network interface device structure
1053 *
1054 * The set_multi entry point is called whenever the multicast address
1055 * list or the network interface flags are updated. This routine is
1056 * responsible for configuring the hardware for proper multicast,
1057 * promiscuous mode, and all-multi behavior.
1058 **/
1059
1060 static void
1061 ixgb_set_multi(struct net_device *netdev)
1062 {
1063 struct ixgb_adapter *adapter = netdev->priv;
1064 struct ixgb_hw *hw = &adapter->hw;
1065 struct dev_mc_list *mc_ptr;
1066 uint32_t rctl;
1067 int i;
1068
1069 /* Check for Promiscuous and All Multicast modes */
1070
1071 rctl = IXGB_READ_REG(hw, RCTL);
1072
1073 if(netdev->flags & IFF_PROMISC) {
1074 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1075 } else if(netdev->flags & IFF_ALLMULTI) {
1076 rctl |= IXGB_RCTL_MPE;
1077 rctl &= ~IXGB_RCTL_UPE;
1078 } else {
1079 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1080 }
1081
1082 if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1083 rctl |= IXGB_RCTL_MPE;
1084 IXGB_WRITE_REG(hw, RCTL, rctl);
1085 } else {
1086 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1087
1088 IXGB_WRITE_REG(hw, RCTL, rctl);
1089
1090 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1091 i++, mc_ptr = mc_ptr->next)
1092 memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1093 mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1094
1095 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1096 }
1097 }
1098
1099 /**
1100 * ixgb_watchdog - Timer Call-back
1101 * @data: pointer to netdev cast into an unsigned long
1102 **/
1103
1104 static void
1105 ixgb_watchdog(unsigned long data)
1106 {
1107 struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1108 struct net_device *netdev = adapter->netdev;
1109 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1110
1111 ixgb_check_for_link(&adapter->hw);
1112
1113 if (ixgb_check_for_bad_link(&adapter->hw)) {
1114 /* force the reset path */
1115 netif_stop_queue(netdev);
1116 }
1117
1118 if(adapter->hw.link_up) {
1119 if(!netif_carrier_ok(netdev)) {
1120 printk(KERN_INFO "ixgb: %s NIC Link is Up %d Mbps %s\n",
1121 netdev->name, 10000, "Full Duplex");
1122 adapter->link_speed = 10000;
1123 adapter->link_duplex = FULL_DUPLEX;
1124 netif_carrier_on(netdev);
1125 netif_wake_queue(netdev);
1126 }
1127 } else {
1128 if(netif_carrier_ok(netdev)) {
1129 adapter->link_speed = 0;
1130 adapter->link_duplex = 0;
1131 printk(KERN_INFO
1132 "ixgb: %s NIC Link is Down\n",
1133 netdev->name);
1134 netif_carrier_off(netdev);
1135 netif_stop_queue(netdev);
1136
1137 }
1138 }
1139
1140 ixgb_update_stats(adapter);
1141
1142 if(!netif_carrier_ok(netdev)) {
1143 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1144 /* We've lost link, so the controller stops DMA,
1145 * but we've got queued Tx work that's never going
1146 * to get done, so reset controller to flush Tx.
1147 * (Do the reset outside of interrupt context). */
1148 schedule_work(&adapter->tx_timeout_task);
1149 }
1150 }
1151
1152 /* Force detection of hung controller every watchdog period */
1153 adapter->detect_tx_hung = TRUE;
1154
1155 /* generate an interrupt to force clean up of any stragglers */
1156 IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1157
1158 /* Reset the timer */
1159 mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1160 }
1161
1162 #define IXGB_TX_FLAGS_CSUM 0x00000001
1163 #define IXGB_TX_FLAGS_VLAN 0x00000002
1164 #define IXGB_TX_FLAGS_TSO 0x00000004
1165
1166 static inline int
1167 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1168 {
1169 #ifdef NETIF_F_TSO
1170 struct ixgb_context_desc *context_desc;
1171 unsigned int i;
1172 uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1173 uint16_t ipcse, tucse, mss;
1174 int err;
1175
1176 if(likely(skb_shinfo(skb)->tso_size)) {
1177 if (skb_header_cloned(skb)) {
1178 err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1179 if (err)
1180 return err;
1181 }
1182
1183 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1184 mss = skb_shinfo(skb)->tso_size;
1185 skb->nh.iph->tot_len = 0;
1186 skb->nh.iph->check = 0;
1187 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1188 skb->nh.iph->daddr,
1189 0, IPPROTO_TCP, 0);
1190 ipcss = skb->nh.raw - skb->data;
1191 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
1192 ipcse = skb->h.raw - skb->data - 1;
1193 tucss = skb->h.raw - skb->data;
1194 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1195 tucse = 0;
1196
1197 i = adapter->tx_ring.next_to_use;
1198 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1199
1200 context_desc->ipcss = ipcss;
1201 context_desc->ipcso = ipcso;
1202 context_desc->ipcse = cpu_to_le16(ipcse);
1203 context_desc->tucss = tucss;
1204 context_desc->tucso = tucso;
1205 context_desc->tucse = cpu_to_le16(tucse);
1206 context_desc->mss = cpu_to_le16(mss);
1207 context_desc->hdr_len = hdr_len;
1208 context_desc->status = 0;
1209 context_desc->cmd_type_len = cpu_to_le32(
1210 IXGB_CONTEXT_DESC_TYPE
1211 | IXGB_CONTEXT_DESC_CMD_TSE
1212 | IXGB_CONTEXT_DESC_CMD_IP
1213 | IXGB_CONTEXT_DESC_CMD_TCP
1214 | IXGB_CONTEXT_DESC_CMD_RS
1215 | IXGB_CONTEXT_DESC_CMD_IDE
1216 | (skb->len - (hdr_len)));
1217
1218 if(++i == adapter->tx_ring.count) i = 0;
1219 adapter->tx_ring.next_to_use = i;
1220
1221 return 1;
1222 }
1223 #endif
1224
1225 return 0;
1226 }
1227
1228 static inline boolean_t
1229 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1230 {
1231 struct ixgb_context_desc *context_desc;
1232 unsigned int i;
1233 uint8_t css, cso;
1234
1235 if(likely(skb->ip_summed == CHECKSUM_HW)) {
1236 css = skb->h.raw - skb->data;
1237 cso = (skb->h.raw + skb->csum) - skb->data;
1238
1239 i = adapter->tx_ring.next_to_use;
1240 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1241
1242 context_desc->tucss = css;
1243 context_desc->tucso = cso;
1244 context_desc->tucse = 0;
1245 /* zero out any previously existing data in one instruction */
1246 *(uint32_t *)&(context_desc->ipcss) = 0;
1247 context_desc->status = 0;
1248 context_desc->hdr_len = 0;
1249 context_desc->mss = 0;
1250 context_desc->cmd_type_len =
1251 cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1252 | IXGB_TX_DESC_CMD_RS
1253 | IXGB_TX_DESC_CMD_IDE);
1254
1255 if(++i == adapter->tx_ring.count) i = 0;
1256 adapter->tx_ring.next_to_use = i;
1257
1258 return TRUE;
1259 }
1260
1261 return FALSE;
1262 }
1263
1264 #define IXGB_MAX_TXD_PWR 14
1265 #define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
1266
1267 static inline int
1268 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1269 unsigned int first)
1270 {
1271 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1272 struct ixgb_buffer *buffer_info;
1273 int len = skb->len;
1274 unsigned int offset = 0, size, count = 0, i;
1275
1276 unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1277 unsigned int f;
1278 len -= skb->data_len;
1279
1280 i = tx_ring->next_to_use;
1281
1282 while(len) {
1283 buffer_info = &tx_ring->buffer_info[i];
1284 size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1285 buffer_info->length = size;
1286 buffer_info->dma =
1287 pci_map_single(adapter->pdev,
1288 skb->data + offset,
1289 size,
1290 PCI_DMA_TODEVICE);
1291 buffer_info->time_stamp = jiffies;
1292
1293 len -= size;
1294 offset += size;
1295 count++;
1296 if(++i == tx_ring->count) i = 0;
1297 }
1298
1299 for(f = 0; f < nr_frags; f++) {
1300 struct skb_frag_struct *frag;
1301
1302 frag = &skb_shinfo(skb)->frags[f];
1303 len = frag->size;
1304 offset = 0;
1305
1306 while(len) {
1307 buffer_info = &tx_ring->buffer_info[i];
1308 size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1309 buffer_info->length = size;
1310 buffer_info->dma =
1311 pci_map_page(adapter->pdev,
1312 frag->page,
1313 frag->page_offset + offset,
1314 size,
1315 PCI_DMA_TODEVICE);
1316 buffer_info->time_stamp = jiffies;
1317
1318 len -= size;
1319 offset += size;
1320 count++;
1321 if(++i == tx_ring->count) i = 0;
1322 }
1323 }
1324 i = (i == 0) ? tx_ring->count - 1 : i - 1;
1325 tx_ring->buffer_info[i].skb = skb;
1326 tx_ring->buffer_info[first].next_to_watch = i;
1327
1328 return count;
1329 }
1330
1331 static inline void
1332 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1333 {
1334 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1335 struct ixgb_tx_desc *tx_desc = NULL;
1336 struct ixgb_buffer *buffer_info;
1337 uint32_t cmd_type_len = adapter->tx_cmd_type;
1338 uint8_t status = 0;
1339 uint8_t popts = 0;
1340 unsigned int i;
1341
1342 if(tx_flags & IXGB_TX_FLAGS_TSO) {
1343 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1344 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1345 }
1346
1347 if(tx_flags & IXGB_TX_FLAGS_CSUM)
1348 popts |= IXGB_TX_DESC_POPTS_TXSM;
1349
1350 if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1351 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1352 }
1353
1354 i = tx_ring->next_to_use;
1355
1356 while(count--) {
1357 buffer_info = &tx_ring->buffer_info[i];
1358 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1359 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1360 tx_desc->cmd_type_len =
1361 cpu_to_le32(cmd_type_len | buffer_info->length);
1362 tx_desc->status = status;
1363 tx_desc->popts = popts;
1364 tx_desc->vlan = cpu_to_le16(vlan_id);
1365
1366 if(++i == tx_ring->count) i = 0;
1367 }
1368
1369 tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1370 | IXGB_TX_DESC_CMD_RS );
1371
1372 /* Force memory writes to complete before letting h/w
1373 * know there are new descriptors to fetch. (Only
1374 * applicable for weak-ordered memory model archs,
1375 * such as IA-64). */
1376 wmb();
1377
1378 tx_ring->next_to_use = i;
1379 IXGB_WRITE_REG(&adapter->hw, TDT, i);
1380 }
1381
1382 /* Tx Descriptors needed, worst case */
1383 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1384 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1385 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
1386 MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1
1387
1388 static int
1389 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1390 {
1391 struct ixgb_adapter *adapter = netdev->priv;
1392 unsigned int first;
1393 unsigned int tx_flags = 0;
1394 unsigned long flags;
1395 int vlan_id = 0;
1396 int tso;
1397
1398 if(skb->len <= 0) {
1399 dev_kfree_skb_any(skb);
1400 return 0;
1401 }
1402
1403 spin_lock_irqsave(&adapter->tx_lock, flags);
1404 if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
1405 netif_stop_queue(netdev);
1406 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1407 return 1;
1408 }
1409 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1410
1411 if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1412 tx_flags |= IXGB_TX_FLAGS_VLAN;
1413 vlan_id = vlan_tx_tag_get(skb);
1414 }
1415
1416 first = adapter->tx_ring.next_to_use;
1417
1418 tso = ixgb_tso(adapter, skb);
1419 if (tso < 0) {
1420 dev_kfree_skb_any(skb);
1421 return NETDEV_TX_OK;
1422 }
1423
1424 if (tso)
1425 tx_flags |= IXGB_TX_FLAGS_TSO;
1426 else if(ixgb_tx_csum(adapter, skb))
1427 tx_flags |= IXGB_TX_FLAGS_CSUM;
1428
1429 ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1430 tx_flags);
1431
1432 netdev->trans_start = jiffies;
1433
1434 return 0;
1435 }
1436
1437 /**
1438 * ixgb_tx_timeout - Respond to a Tx Hang
1439 * @netdev: network interface device structure
1440 **/
1441
1442 static void
1443 ixgb_tx_timeout(struct net_device *netdev)
1444 {
1445 struct ixgb_adapter *adapter = netdev->priv;
1446
1447 /* Do the reset outside of interrupt context */
1448 schedule_work(&adapter->tx_timeout_task);
1449 }
1450
1451 static void
1452 ixgb_tx_timeout_task(struct net_device *netdev)
1453 {
1454 struct ixgb_adapter *adapter = netdev->priv;
1455
1456 ixgb_down(adapter, TRUE);
1457 ixgb_up(adapter);
1458 }
1459
1460 /**
1461 * ixgb_get_stats - Get System Network Statistics
1462 * @netdev: network interface device structure
1463 *
1464 * Returns the address of the device statistics structure.
1465 * The statistics are actually updated from the timer callback.
1466 **/
1467
1468 static struct net_device_stats *
1469 ixgb_get_stats(struct net_device *netdev)
1470 {
1471 struct ixgb_adapter *adapter = netdev->priv;
1472
1473 return &adapter->net_stats;
1474 }
1475
1476 /**
1477 * ixgb_change_mtu - Change the Maximum Transfer Unit
1478 * @netdev: network interface device structure
1479 * @new_mtu: new value for maximum frame size
1480 *
1481 * Returns 0 on success, negative on failure
1482 **/
1483
1484 static int
1485 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1486 {
1487 struct ixgb_adapter *adapter = netdev->priv;
1488 int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1489 int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1490
1491
1492 if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1493 || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1494 IXGB_ERR("Invalid MTU setting\n");
1495 return -EINVAL;
1496 }
1497
1498 if((max_frame <= IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1499 || (max_frame <= IXGB_RXBUFFER_2048)) {
1500 adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
1501
1502 } else if(max_frame <= IXGB_RXBUFFER_4096) {
1503 adapter->rx_buffer_len = IXGB_RXBUFFER_4096;
1504
1505 } else if(max_frame <= IXGB_RXBUFFER_8192) {
1506 adapter->rx_buffer_len = IXGB_RXBUFFER_8192;
1507
1508 } else {
1509 adapter->rx_buffer_len = IXGB_RXBUFFER_16384;
1510 }
1511
1512 netdev->mtu = new_mtu;
1513
1514 if(old_max_frame != max_frame && netif_running(netdev)) {
1515
1516 ixgb_down(adapter, TRUE);
1517 ixgb_up(adapter);
1518 }
1519
1520 return 0;
1521 }
1522
1523 /**
1524 * ixgb_update_stats - Update the board statistics counters.
1525 * @adapter: board private structure
1526 **/
1527
1528 void
1529 ixgb_update_stats(struct ixgb_adapter *adapter)
1530 {
1531 adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1532 adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1533 adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1534 adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1535 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1536 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1537 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1538 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1539 adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1540 adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1541 adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1542 adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1543 adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1544 adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1545 adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1546 adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1547 adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1548 adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1549 adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1550 adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1551 adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1552 adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1553 adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1554 adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1555 adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1556 adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1557 adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1558 adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1559 adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1560 adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1561 adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1562 adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1563 adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1564 adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1565 adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1566 adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1567 adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1568 adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1569 adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1570 adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1571 adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1572 adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1573 adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1574 adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1575 adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1576 adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1577 adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1578 adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1579 adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1580 adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1581 adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1582 adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1583 adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1584 adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1585 adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1586 adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1587 adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1588 adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1589 adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1590 adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1591
1592 /* Fill out the OS statistics structure */
1593
1594 adapter->net_stats.rx_packets = adapter->stats.gprcl;
1595 adapter->net_stats.tx_packets = adapter->stats.gptcl;
1596 adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1597 adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1598 adapter->net_stats.multicast = adapter->stats.mprcl;
1599 adapter->net_stats.collisions = 0;
1600
1601 /* ignore RLEC as it reports errors for padded (<64bytes) frames
1602 * with a length in the type/len field */
1603 adapter->net_stats.rx_errors =
1604 /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1605 adapter->stats.ruc +
1606 adapter->stats.roc /*+ adapter->stats.rlec */ +
1607 adapter->stats.icbc +
1608 adapter->stats.ecbc + adapter->stats.mpc;
1609
1610 adapter->net_stats.rx_dropped = adapter->stats.mpc;
1611
1612 /* see above
1613 * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1614 */
1615
1616 adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1617 adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1618 adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1619 adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1620
1621 adapter->net_stats.tx_errors = 0;
1622 adapter->net_stats.rx_frame_errors = 0;
1623 adapter->net_stats.tx_aborted_errors = 0;
1624 adapter->net_stats.tx_carrier_errors = 0;
1625 adapter->net_stats.tx_fifo_errors = 0;
1626 adapter->net_stats.tx_heartbeat_errors = 0;
1627 adapter->net_stats.tx_window_errors = 0;
1628 }
1629
1630 #define IXGB_MAX_INTR 10
1631 /**
1632 * ixgb_intr - Interrupt Handler
1633 * @irq: interrupt number
1634 * @data: pointer to a network interface device structure
1635 * @pt_regs: CPU registers structure
1636 **/
1637
1638 static irqreturn_t
1639 ixgb_intr(int irq, void *data, struct pt_regs *regs)
1640 {
1641 struct net_device *netdev = data;
1642 struct ixgb_adapter *adapter = netdev->priv;
1643 struct ixgb_hw *hw = &adapter->hw;
1644 uint32_t icr = IXGB_READ_REG(hw, ICR);
1645 #ifndef CONFIG_IXGB_NAPI
1646 unsigned int i;
1647 #endif
1648
1649 if(unlikely(!icr))
1650 return IRQ_NONE; /* Not our interrupt */
1651
1652 if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1653 mod_timer(&adapter->watchdog_timer, jiffies);
1654 }
1655
1656 #ifdef CONFIG_IXGB_NAPI
1657 if(netif_rx_schedule_prep(netdev)) {
1658
1659 /* Disable interrupts and register for poll. The flush
1660 of the posted write is intentionally left out.
1661 */
1662
1663 atomic_inc(&adapter->irq_sem);
1664 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1665 __netif_rx_schedule(netdev);
1666 }
1667 #else
1668 /* yes, that is actually a & and it is meant to make sure that
1669 * every pass through this for loop checks both receive and
1670 * transmit queues for completed descriptors, intended to
1671 * avoid starvation issues and assist tx/rx fairness. */
1672 for(i = 0; i < IXGB_MAX_INTR; i++)
1673 if(!ixgb_clean_rx_irq(adapter) &
1674 !ixgb_clean_tx_irq(adapter))
1675 break;
1676 #endif
1677 return IRQ_HANDLED;
1678 }
1679
1680 #ifdef CONFIG_IXGB_NAPI
1681 /**
1682 * ixgb_clean - NAPI Rx polling callback
1683 * @adapter: board private structure
1684 **/
1685
1686 static int
1687 ixgb_clean(struct net_device *netdev, int *budget)
1688 {
1689 struct ixgb_adapter *adapter = netdev->priv;
1690 int work_to_do = min(*budget, netdev->quota);
1691 int tx_cleaned;
1692 int work_done = 0;
1693
1694 tx_cleaned = ixgb_clean_tx_irq(adapter);
1695 ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1696
1697 *budget -= work_done;
1698 netdev->quota -= work_done;
1699
1700 /* if no Tx and not enough Rx work done, exit the polling mode */
1701 if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1702 netif_rx_complete(netdev);
1703 ixgb_irq_enable(adapter);
1704 return 0;
1705 }
1706
1707 return 1;
1708 }
1709 #endif
1710
1711 /**
1712 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1713 * @adapter: board private structure
1714 **/
1715
1716 static boolean_t
1717 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1718 {
1719 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1720 struct net_device *netdev = adapter->netdev;
1721 struct ixgb_tx_desc *tx_desc, *eop_desc;
1722 struct ixgb_buffer *buffer_info;
1723 unsigned int i, eop;
1724 boolean_t cleaned = FALSE;
1725
1726 i = tx_ring->next_to_clean;
1727 eop = tx_ring->buffer_info[i].next_to_watch;
1728 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1729
1730 while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1731
1732 for(cleaned = FALSE; !cleaned; ) {
1733 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1734 buffer_info = &tx_ring->buffer_info[i];
1735
1736 if (tx_desc->popts
1737 & (IXGB_TX_DESC_POPTS_TXSM |
1738 IXGB_TX_DESC_POPTS_IXSM))
1739 adapter->hw_csum_tx_good++;
1740
1741 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1742
1743 *(uint32_t *)&(tx_desc->status) = 0;
1744
1745 cleaned = (i == eop);
1746 if(++i == tx_ring->count) i = 0;
1747 }
1748
1749 eop = tx_ring->buffer_info[i].next_to_watch;
1750 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1751 }
1752
1753 tx_ring->next_to_clean = i;
1754
1755 spin_lock(&adapter->tx_lock);
1756 if(cleaned && netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1757 (IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE)) {
1758
1759 netif_wake_queue(netdev);
1760 }
1761 spin_unlock(&adapter->tx_lock);
1762
1763 if(adapter->detect_tx_hung) {
1764 /* detect a transmit hang in hardware, this serializes the
1765 * check with the clearing of time_stamp and movement of i */
1766 adapter->detect_tx_hung = FALSE;
1767 if(tx_ring->buffer_info[i].dma &&
1768 time_after(jiffies, tx_ring->buffer_info[i].time_stamp + HZ)
1769 && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1770 IXGB_STATUS_TXOFF))
1771 netif_stop_queue(netdev);
1772 }
1773
1774 return cleaned;
1775 }
1776
1777 /**
1778 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1779 * @adapter: board private structure
1780 * @rx_desc: receive descriptor
1781 * @sk_buff: socket buffer with received data
1782 **/
1783
1784 static inline void
1785 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1786 struct ixgb_rx_desc *rx_desc,
1787 struct sk_buff *skb)
1788 {
1789 /* Ignore Checksum bit is set OR
1790 * TCP Checksum has not been calculated
1791 */
1792 if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1793 (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1794 skb->ip_summed = CHECKSUM_NONE;
1795 return;
1796 }
1797
1798 /* At this point we know the hardware did the TCP checksum */
1799 /* now look at the TCP checksum error bit */
1800 if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1801 /* let the stack verify checksum errors */
1802 skb->ip_summed = CHECKSUM_NONE;
1803 adapter->hw_csum_rx_error++;
1804 } else {
1805 /* TCP checksum is good */
1806 skb->ip_summed = CHECKSUM_UNNECESSARY;
1807 adapter->hw_csum_rx_good++;
1808 }
1809 }
1810
1811 /**
1812 * ixgb_clean_rx_irq - Send received data up the network stack,
1813 * @adapter: board private structure
1814 **/
1815
1816 static boolean_t
1817 #ifdef CONFIG_IXGB_NAPI
1818 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1819 #else
1820 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1821 #endif
1822 {
1823 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1824 struct net_device *netdev = adapter->netdev;
1825 struct pci_dev *pdev = adapter->pdev;
1826 struct ixgb_rx_desc *rx_desc, *next_rxd;
1827 struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1828 struct sk_buff *skb, *next_skb;
1829 uint32_t length;
1830 unsigned int i, j;
1831 boolean_t cleaned = FALSE;
1832
1833 i = rx_ring->next_to_clean;
1834 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1835 buffer_info = &rx_ring->buffer_info[i];
1836
1837 while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1838
1839 #ifdef CONFIG_IXGB_NAPI
1840 if(*work_done >= work_to_do)
1841 break;
1842
1843 (*work_done)++;
1844 #endif
1845 skb = buffer_info->skb;
1846 prefetch(skb->data);
1847
1848 if(++i == rx_ring->count) i = 0;
1849 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1850 prefetch(next_rxd);
1851
1852 if((j = i + 1) == rx_ring->count) j = 0;
1853 next2_buffer = &rx_ring->buffer_info[j];
1854 prefetch(next2_buffer);
1855
1856 next_buffer = &rx_ring->buffer_info[i];
1857 next_skb = next_buffer->skb;
1858 prefetch(next_skb);
1859
1860
1861 cleaned = TRUE;
1862
1863 pci_unmap_single(pdev,
1864 buffer_info->dma,
1865 buffer_info->length,
1866 PCI_DMA_FROMDEVICE);
1867
1868 length = le16_to_cpu(rx_desc->length);
1869
1870 if(unlikely(!(rx_desc->status & IXGB_RX_DESC_STATUS_EOP))) {
1871
1872 /* All receives must fit into a single buffer */
1873
1874 IXGB_DBG("Receive packet consumed multiple buffers "
1875 "length<%x>\n", length);
1876
1877 dev_kfree_skb_irq(skb);
1878 rx_desc->status = 0;
1879 buffer_info->skb = NULL;
1880
1881 rx_desc = next_rxd;
1882 buffer_info = next_buffer;
1883 continue;
1884 }
1885
1886 if (unlikely(rx_desc->errors
1887 & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1888 | IXGB_RX_DESC_ERRORS_P |
1889 IXGB_RX_DESC_ERRORS_RXE))) {
1890
1891 dev_kfree_skb_irq(skb);
1892 rx_desc->status = 0;
1893 buffer_info->skb = NULL;
1894
1895 rx_desc = next_rxd;
1896 buffer_info = next_buffer;
1897 continue;
1898 }
1899
1900 /* Good Receive */
1901 skb_put(skb, length);
1902
1903 /* Receive Checksum Offload */
1904 ixgb_rx_checksum(adapter, rx_desc, skb);
1905
1906 skb->protocol = eth_type_trans(skb, netdev);
1907 #ifdef CONFIG_IXGB_NAPI
1908 if(adapter->vlgrp && (rx_desc->status & IXGB_RX_DESC_STATUS_VP)) {
1909 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1910 le16_to_cpu(rx_desc->special) &
1911 IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1912 } else {
1913 netif_receive_skb(skb);
1914 }
1915 #else /* CONFIG_IXGB_NAPI */
1916 if(adapter->vlgrp && (rx_desc->status & IXGB_RX_DESC_STATUS_VP)) {
1917 vlan_hwaccel_rx(skb, adapter->vlgrp,
1918 le16_to_cpu(rx_desc->special) &
1919 IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1920 } else {
1921 netif_rx(skb);
1922 }
1923 #endif /* CONFIG_IXGB_NAPI */
1924 netdev->last_rx = jiffies;
1925
1926 rx_desc->status = 0;
1927 buffer_info->skb = NULL;
1928
1929 rx_desc = next_rxd;
1930 buffer_info = next_buffer;
1931 }
1932
1933 rx_ring->next_to_clean = i;
1934
1935 ixgb_alloc_rx_buffers(adapter);
1936
1937 return cleaned;
1938 }
1939
1940 /**
1941 * ixgb_alloc_rx_buffers - Replace used receive buffers
1942 * @adapter: address of board private structure
1943 **/
1944
1945 static void
1946 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
1947 {
1948 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1949 struct net_device *netdev = adapter->netdev;
1950 struct pci_dev *pdev = adapter->pdev;
1951 struct ixgb_rx_desc *rx_desc;
1952 struct ixgb_buffer *buffer_info;
1953 struct sk_buff *skb;
1954 unsigned int i;
1955 int num_group_tail_writes;
1956 long cleancount;
1957
1958 i = rx_ring->next_to_use;
1959 buffer_info = &rx_ring->buffer_info[i];
1960 cleancount = IXGB_DESC_UNUSED(rx_ring);
1961
1962 num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
1963
1964 /* leave one descriptor unused */
1965 while(--cleancount > 0) {
1966 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1967
1968 skb = dev_alloc_skb(adapter->rx_buffer_len + NET_IP_ALIGN);
1969
1970 if(unlikely(!skb)) {
1971 /* Better luck next round */
1972 break;
1973 }
1974
1975 /* Make buffer alignment 2 beyond a 16 byte boundary
1976 * this will result in a 16 byte aligned IP header after
1977 * the 14 byte MAC header is removed
1978 */
1979 skb_reserve(skb, NET_IP_ALIGN);
1980
1981 skb->dev = netdev;
1982
1983 buffer_info->skb = skb;
1984 buffer_info->length = adapter->rx_buffer_len;
1985 buffer_info->dma =
1986 pci_map_single(pdev,
1987 skb->data,
1988 adapter->rx_buffer_len,
1989 PCI_DMA_FROMDEVICE);
1990
1991 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1992
1993 if((i & ~(num_group_tail_writes- 1)) == i) {
1994 /* Force memory writes to complete before letting h/w
1995 * know there are new descriptors to fetch. (Only
1996 * applicable for weak-ordered memory model archs,
1997 * such as IA-64). */
1998 wmb();
1999
2000 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2001 }
2002
2003 if(++i == rx_ring->count) i = 0;
2004 buffer_info = &rx_ring->buffer_info[i];
2005 }
2006
2007 rx_ring->next_to_use = i;
2008 }
2009
2010 /**
2011 * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2012 *
2013 * @param netdev network interface device structure
2014 * @param grp indicates to enable or disable tagging/stripping
2015 **/
2016 static void
2017 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2018 {
2019 struct ixgb_adapter *adapter = netdev->priv;
2020 uint32_t ctrl, rctl;
2021
2022 ixgb_irq_disable(adapter);
2023 adapter->vlgrp = grp;
2024
2025 if(grp) {
2026 /* enable VLAN tag insert/strip */
2027 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2028 ctrl |= IXGB_CTRL0_VME;
2029 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2030
2031 /* enable VLAN receive filtering */
2032
2033 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2034 rctl |= IXGB_RCTL_VFE;
2035 rctl &= ~IXGB_RCTL_CFIEN;
2036 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2037 } else {
2038 /* disable VLAN tag insert/strip */
2039
2040 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2041 ctrl &= ~IXGB_CTRL0_VME;
2042 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2043
2044 /* disable VLAN filtering */
2045
2046 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2047 rctl &= ~IXGB_RCTL_VFE;
2048 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2049 }
2050
2051 ixgb_irq_enable(adapter);
2052 }
2053
2054 static void
2055 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2056 {
2057 struct ixgb_adapter *adapter = netdev->priv;
2058 uint32_t vfta, index;
2059
2060 /* add VID to filter table */
2061
2062 index = (vid >> 5) & 0x7F;
2063 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2064 vfta |= (1 << (vid & 0x1F));
2065 ixgb_write_vfta(&adapter->hw, index, vfta);
2066 }
2067
2068 static void
2069 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2070 {
2071 struct ixgb_adapter *adapter = netdev->priv;
2072 uint32_t vfta, index;
2073
2074 ixgb_irq_disable(adapter);
2075
2076 if(adapter->vlgrp)
2077 adapter->vlgrp->vlan_devices[vid] = NULL;
2078
2079 ixgb_irq_enable(adapter);
2080
2081 /* remove VID from filter table*/
2082
2083 index = (vid >> 5) & 0x7F;
2084 vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2085 vfta &= ~(1 << (vid & 0x1F));
2086 ixgb_write_vfta(&adapter->hw, index, vfta);
2087 }
2088
2089 static void
2090 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2091 {
2092 ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2093
2094 if(adapter->vlgrp) {
2095 uint16_t vid;
2096 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2097 if(!adapter->vlgrp->vlan_devices[vid])
2098 continue;
2099 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2100 }
2101 }
2102 }
2103
2104 /**
2105 * ixgb_notify_reboot - handles OS notification of reboot event.
2106 * @param nb notifier block, unused
2107 * @param event Event being passed to driver to act upon
2108 * @param p A pointer to our net device
2109 **/
2110 static int
2111 ixgb_notify_reboot(struct notifier_block *nb, unsigned long event, void *p)
2112 {
2113 struct pci_dev *pdev = NULL;
2114
2115 switch(event) {
2116 case SYS_DOWN:
2117 case SYS_HALT:
2118 case SYS_POWER_OFF:
2119 while ((pdev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, pdev))) {
2120 if (pci_dev_driver(pdev) == &ixgb_driver)
2121 ixgb_suspend(pdev, 3);
2122 }
2123 }
2124 return NOTIFY_DONE;
2125 }
2126
2127 /**
2128 * ixgb_suspend - driver suspend function called from notify.
2129 * @param pdev pci driver structure used for passing to
2130 * @param state power state to enter
2131 **/
2132 static int
2133 ixgb_suspend(struct pci_dev *pdev, uint32_t state)
2134 {
2135 struct net_device *netdev = pci_get_drvdata(pdev);
2136 struct ixgb_adapter *adapter = netdev->priv;
2137
2138 netif_device_detach(netdev);
2139
2140 if(netif_running(netdev))
2141 ixgb_down(adapter, TRUE);
2142
2143 pci_save_state(pdev);
2144
2145 state = (state > 0) ? 3 : 0;
2146 pci_set_power_state(pdev, state);
2147 msec_delay(200);
2148
2149 return 0;
2150 }
2151
2152 #ifdef CONFIG_NET_POLL_CONTROLLER
2153 /*
2154 * Polling 'interrupt' - used by things like netconsole to send skbs
2155 * without having to re-enable interrupts. It's not called while
2156 * the interrupt routine is executing.
2157 */
2158
2159 static void ixgb_netpoll(struct net_device *dev)
2160 {
2161 struct ixgb_adapter *adapter = dev->priv;
2162 disable_irq(adapter->pdev->irq);
2163 ixgb_intr(adapter->pdev->irq, dev, NULL);
2164 enable_irq(adapter->pdev->irq);
2165 }
2166 #endif
2167
2168 /* ixgb_main.c */